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  • Title: A heptapeptide repeat contributes to the unusual length of chloroplast ribosomal protein S18. Nucleotide sequence and map position of the rpl33-rps18 gene cluster in maize.
    Author: Weglöhner W, Subramanian AR.
    Journal: FEBS Lett; 1991 Feb 25; 279(2):193-7. PubMed ID: 1840527.
    Abstract:
    The rpl33-rps18 gene cluster of the maize chloroplast genome has been mapped and sequenced. The derived amino acid sequence of the S18 protein shows a 7-fold repeat of a hydrophilic heptapeptide domain, S K Q P F R K, in the N-terminal region. Such a sequence is absent in the E. coli S18 and in the chloroplast S18 of the lower plant liverwort. In tobacco and rice chloroplast S18 it is present 2 and 6 times, respectively. Thus a long N-terminal repeat (resembling in composition the large C-terminal heptapeptide repeat in the eukaryotic pol II) appears to be characteristic of monocot cereal S18.
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